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Snow on Mars: NASA Spacecraft Spots 'Dry Ice' Snowflakes
Researchers have calculated that carbon dioxide snow particles on Mars are roughly the size of a human red blood cell. Martian snow is depicted in this artist's rendering as a mist or fog that eventually settles to the surface.

Mysterious images from Mars

September 17, 2012

A spacecraft orbiting Mars has detected carbon dioxide snow falling on the Red Planet, making Mars the only body in the solar system known to host this weird weather phenomenon. (Sept. 17)